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Introduction There is a wide range of cardiac conditions that may significantly increase the risk of sudden cardiac death (SCD). They range from ischaemic heart disease to inherited cardiac conditions, such as hypertrophic obstructive cardiomyopathy, and these may be in the setting of primary or secondary prevention. Potential device candidates are expected to have a reasonable life-expectancy of at least one year.1 While clear guidelines help cardiologists and their multi-disciplinary teams to steer the right patients forward for a defibrillator device and to the right type, it is recognised that it may be difficult to assess the frailty of